Bathtub



FIG. 1 is a perspective view of a bathtub showing our design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines in the drawings represent unclaimed portions of the bathtub and form no part thereof. 

The ornamental design for a bathtub, as shown and described. 